Crack growth behavior of 4340 steel under corrosion and corrosion fatigue conditions

被引:5
|
作者
Sadananda, K. [1 ]
Vasudevan, A. K. [1 ]
机构
[1] Tech Data Anal Inc, Falls Church, VA 22043 USA
关键词
4340; steel; crack initiation and propagation; Kitagawa diagram; mechanical and chemical internal stresses; notch stress concentration; two driving force parameter; GASEOUS-HYDROGEN EMBRITTLEMENT; DIAGRAM;
D O I
10.1515/corrrev-2015-0034
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
Crack initiation and growth behavior in 4340 steel under static and cyclic loads in various environments are examined using the two-parameter approach developed by the authors. It is shown that environmental effects can be time dependent, stress dependent, or both, depending on the amplitude, peak stress, and aggressiveness of the environment. It is shown that the tests under vacuum are required to establish the reference state for the quantification of the chemical driving forces involved in crack initiation and growth in aggressive environments. Failure diagrams are proposed by extending the Kitagawa-Takahashi diagram for fatigue. It is shown that these can be used to quantify the mechanical and chemical internal stresses required to cause both initiation and growth of an incipient crack in a smooth as well as notched specimens. Conditions for propagating and nonpropagating incipient cracks that are initiated under stress concentrations are also discussed, taking the example of the 4340 steel data available.
引用
收藏
页码:335 / 349
页数:15
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